Sublethal Effects of Imidacloprid on Fecundity, Apoptosis and Virus Transmission in the Small Brown Planthopper Laodelphax striatellus

Zhang, Yuanyuan; Xu, Gang; Yu, Jingquan; Ma, Chunzi; Yang, Guo-Qing

doi:10.3390/insects12121131

Cited by 9 publications

(3 citation statements)

References 67 publications

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“…The fecundity of Laodelphax striatellus was significantly decreased by imidacloprid LC 30 treatment. However, the fecundity was significantly increased when the test insects were treated with an LC 10 dose of imidacloprid ( Zhang et al, 2021b ). When the third-instar DBM larvae were treated with a LC 20 dose of emamectin benzoate in this study the development time of larvae was prolonged by 17.0 ± 3.0 h, the pupation rate of F 0 larvae was decreased by 9.40%, the pupa weight was increased by 14.63%, the average single female oviposition number increased by 30.9 eggs, and the longevity of female adults was shortened by 10.10%.…”

Section: Discussionmentioning

confidence: 99%

Sublethal effects and reproductive hormesis of emamectin benzoate on Plutella xylostella

Liu

Guo²,

Zhang³

et al. 2022

Front. Physiol.

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The diamondback moth (DBM), Plutella xylostella L., is an important pest of cruciferous vegetables, and population control mainly depends on chemical pesticides. Emamectin benzoate is a highly effective insecticide used for controlling DBM. However, it is unknown how the sublethal effects of low concentration residues of emamectin benzoate on DBM. So the population development sublethal effects of emamectin benzoate, at LC5, LC10, and LC20 with concentrations of 0.014 mg/L, 0.024 mg/L and 0.047 mg/L, respectively, on adult DBM and their progeny were investigated in this study. The pupal weight, pupal period, female fecundity, and vitellin content of the F0 DBM generation increased significantly compared to the control. And the single female oviposition number of DBM was increased by 20.21% with LC20 treatment. The pupation rate, adult longevity and ovariole length of the treatment groups decreased significantly. The fecundity of DBM in the treatment groups increased, and this increased the population by a presumptive 13.84%. Treatment also led to the shortening of ovarioles and the reduction of egg hatching, and increased pupal weight in the F1 generation. We concluded that the effects of sublethal/low concentration emamectin benzoate on the different life stages of DBM were variable, and the reproductive hormesis on DBM adults were attractive findings.

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Section: Discussionmentioning

confidence: 99%

Sublethal effects and reproductive hormesis of emamectin benzoate on Plutella xylostella

Liu

Guo²,

Zhang³

et al. 2022

Front. Physiol.

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“…Cages were made of nylon mesh cloth, having a zippered entrance on one side. Rice seedlings were changed every 10-14 days to assure sufficient nutrition for SBPH [53].…”

Section: Plant and Insectmentioning

confidence: 99%

Decoyinine Induced Resistance in Rice against Small Brown Planthopper Laodelphax striatellus

Zhang

et al. 2022

Insects

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Induced resistance against SBPH via microbial pesticides is considered as an eco-friendly and promising management approach. In this study, the induced resistance against SBPH in rice seedling by a new potential microbial pesticide, decoyinine (DCY), a secondary metabolite produced by Streptomyces hygroscopicus, was evaluated to investigate the effects of DCY on SBPH’s biological and population parameters along with defense-related physiological and biochemical indices in rice against SBPH feeding. We found that DCY has potential to improve rice resistance and significantly reduced the fecundity of SBPH. Laboratory results revealed that DCY treated rice significantly changed SBPH’s fecundity and population life table parameters. The concentrations of hydrogen peroxide (H2O2), soluble sugars and malondialdehyde (MDA) were significantly lower in DCY treated rice plants against SBPH infestation at 24, 48 and 96 hours post infestation (hpi), respectively. The concentrations of antioxidant enzymes, catalase (CAT) was significantly higher at 72 hpi, while super oxidase dismutase (SOD) and peroxidase (POD) concentrations were recorded higher at 96 hpi. The concentrations of synthases enzymes, phenyl alanine ammonia-lyase (PAL) was higher at 48 hpi, whereas polyphenol oxidase (PPO) concentration was maximum at 72 hpi against SBPH infestation. The results imply that DCY has unique properties to enhance rice resistance against SBPH by stimulating plant defensive responses. Microbial pesticides may be developed as an alternative to chemical pest control.

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“…On the one hand, low-dose exposure to insecticides can stimulate biological processes that increase survival and reproduction. For instance, sublethal doses of imidacloprid stimulate reproduction in aphids [ 5 , 6 , 7 ]. On the other hand, sublethal doses of insecticides can cause reduced reproduction, decreased longevity, delayed development, and compromised locomotion or learning in pest insects, beneficial insects, as well as non-target organisms [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

The Synergistic Effect of Thiamethoxam and Synapsin dsRNA Targets Neurotransmission to Induce Mortality in Aphis gossypii

Wang

Lin

et al. 2022

IJMS

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Sublethal doses of insecticides have many impacts on pest control and agroecosystems. Insects that survive a sublethal dose of insecticide could adapt their physiological and behavioral functions and resist this environmental stress, which contributes to the challenge of pest management. In this study, the sublethal effects of thiamethoxam on gene expression were measured through RNA sequencing in the melon aphid Aphis gossypii. Genes regulating energy production were downregulated, while genes related to neural function were upregulated. To further address the function of genes related to neurotransmission, RNA interference (RNAi) was implemented by transdermal delivery of dsRNA targeting synapsin (syn), a gene regulating presynaptic vesicle clustering. The gene expression of synapsin was knocked down and the mortality of aphids was increased significantly over the duration of the assay. Co-delivery of syn-dsRNA and thiamethoxam reversed the upregulation of synapsin caused by low-dose thiamethoxam and resulted in lethality to melon aphids, suggesting that the decreased presynaptic function may contribute to this synergistic lethal effect. In addition, the nanocarrier star polycation, which could bind both dsRNA and thiamethoxam, greatly improved the efficacy of lethality. These results increase our knowledge of the gene regulation induced by sublethal exposure to neonicotinoids and indicated that synapsin could be a potential RNAi target for resistance management of the melon aphid.

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Sublethal Effects of Imidacloprid on Fecundity, Apoptosis and Virus Transmission in the Small Brown Planthopper Laodelphax striatellus

Cited by 9 publications

References 67 publications

Sublethal effects and reproductive hormesis of emamectin benzoate on Plutella xylostella

Sublethal effects and reproductive hormesis of emamectin benzoate on Plutella xylostella

Decoyinine Induced Resistance in Rice against Small Brown Planthopper Laodelphax striatellus

The Synergistic Effect of Thiamethoxam and Synapsin dsRNA Targets Neurotransmission to Induce Mortality in Aphis gossypii

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